Although Larry Olubamiwo used numerous doping products, he tested positive just for EPO

The boxer Larry “War Machine” Olubamiwo took several anabolic steroids, HGH, IGF-1 and other doping medications during 6 years. However certain tests have been conducted earlier, he was caught just in January 2012. After a fight against Sam Sexton Larry Olubamiwo tested positive for banned drugs. Metabolites of steroids were not found in his sample. The athlete tested positive for EPO. EPO is a blood boosting medicine.
Prolonged usage of forbidden medications by Olubamiwo was a real embarrassment for the United Kingdom Anti-Doping. Andy Parkinson, the CEO of the UKAD, tried to note that the suspension of Olubamiwo for administration of 13 different prohibited medicines is a real success of the UKAD in the struggle against doping.  
Andy Parkinson affirmed that it was an unusual case. The boxer used steroids and other related medicines for long period of time without fear to spoil his health, career and reputation. He was sentenced to 4-year ban.
But the alarming aspect is following: Olumamiwo could avoid detection for prolonged time, despites essential efforts of anti-doping officers to “clean” sports from application of doping preparations.
Olubamiwo was caught just because the UKAD was informed by the United States Drug Enforcement Administration (DEA) that he became the target of an investigation related to illicit sale of anabolic steroids and other related drugs in the US. Then the UKAD conducted a test that resulted in positive results for EPO.
Robert Smith, the General Secretary for the British Boxing Board of Control, supported the affirmations of Andy Parkinson about efforts and success of anti-doping agencies. He noticed that the case manifested that cheating couldn’t be hidden.
What is your point of view about the case? Do positives for EPO and the ban of Olubamiwo display that anti-doping officers work successfully? Or does the case demonstrate that anti-doping system is not appropriate?
Anyone may make own conclusion. But it is clear that the athlete could apply different prohibited products for six years without being caught by anti-doping officers.